Tool for spinning angular flanges on metal tubes



March 10, 1931. w. E. ARNDT 1,795,358

TooL FOR sPINNING ANGULAR FLANGES oN METAL TUBES Filed oct. 24. 1929 fil/em mm INVENToR ATTORN EY Patented Mar. 10, 1931 'l f UNITED STATES PATENT oFFicE WILLIAM E..ARNDT, OF IEEYJROIT,v MICHIGAN, ASSIGNOR TO C. M. SMILLIE & OOIMIPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN TOOL FOR SPINNING ANGULAR FLANGES ON METAL TUBES Application lcd October 24, 1929. Serial No. 402,182.

My'invention relates to a tool for spinning.

angular flanges on the ends of metal tubes,

shown inthe accompanying drawings and more particularly pointed out in the follow- VB ing specification and claims.

Heretofore it has been the practice to drive a tapering plug into the end of metal tubes to form the inclined flange which receives the thrust of the coupling nut serving to connect 1 the tube with a pipe fitting. The tube is supported when formingvthe flange in a perforated block.

The tube supporting block is constructed Awith a plurality of holes ofdif'ferent diame- '35 ters corresponding in diameter with that of standardized tubes; the upper portion of the wall surrounding each hole being tapered to receive the flaring end of the tube upon driving the tapering plug into the latter. This 2 method vof flanging is a comparatively slow process and frequently terminates in a fracture of the tube due to the metal hardening and crystallizing, caused by pounding the plug into the tube. The loss thus occasioned is considerable and the time required Vto flare lie ends greatly adds to the cost of producion.

It is therefore the purpose of the present invention to provide a tool, adapted to quick- 8 ly flare the ends of tubes of different diameters without danger of fracture,-the flared portion presenting a smooth -polished uniform appearance, insuring a tight yjoint when s connected with a pipe fitting.

vide means whereby the Haring operation of the device is controlled by adjustable means adapted to determine and limit the extent of the flared portion of the tube.

With the foregoing and other objects in view which will appear as the description proceeds, the invention further resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes maybe made in the precise embodiment of the invention herein disclosed-with.- out departing from the spirit of the same.

cation A further object of the invention is to prowall, are a plurality of high grade steel roll- In the drawings accompanying this speci.

Figure 1 is a plan view of the device, showing a tube in dotted lines as it would appear l when flanged.

Figure 2 is a side elevation of the tool, with parts broken away and in section. l

Figure 3 is a cross-sectional view through the tool taken on or about line 3-3 of Figure 2. f

Figure 4 is a cross-sectional view of a detail of the device, taken onor about line 4-4 of Figure 2 looking toward the end of the cone-shaped expander and an integral part of the crank actuated screw shaft.

Figure 5 is a perspective view of the tube before forming the inclined flange on its end.

Figure 6 is a perspective view of the tube showing the tapering flange formed on one end of the tube to receive the coupling nut of. a pipe union or other fitting.

Referring now to the letters of reference placed upon the drawings:

A denotes a C* haped casting forming d handle having an integral, annular bearing A1, projecting outwardly from one end of the handle toreceive a screw-tapped bushinv B.

' D denotes a screw extending through the bearing A1 into a peripheral groove in the bushing to secure the latter in position.

D4 denotes a screw shaft supported in the bushing B and provided at its forward end with a cone-shaped head D1 integral with the shaft. .In the inclined face of the coneshaped head D1 are a lurality of peripheral bores D2 parallel wit the inclined face of the head. Lodged in the bores andprojecting through an open slot in thehead that they may extend above the surface while being held by the overlapping edges of the ers E. v

Findicates a nut screwed on the shaft D, having an inclined f bearing againstA acorrespondingly inclne'd surface at the back z ofthe headlD1 and verl'apping the ends of the rollers E to receive the end thrust bf the rollers, and tol secure the latterl against dislodgement. G indicates a crank arm for manually rotating-the-screw shaft D. H denotes a nut mounted on the screw shaft which may be adjusted to limit the forward movement of the shaft when actuated by the crank arm.

I denotes a set-screw projecting through the bea-ring A1 adapted to impinge upon the bushing B, to secure it against rotatlng with the shaft D when the latter is actuated to forma flange on the tubing.

J is a chuck comprising a pair of blocks J1, J1 bored to receive and support a tube K.

On the end of the tube K, a flaring flange K1 is to be formed, to adapt the tube for connection with a pipe or other iitting,-not` shown. The blocks forming the chuck J are supported between spaced walls A2, A2 projecting from the handle A,of which they are integral part.

L denotes an adjustable set-screw screwed into the wall A2, adapted to bear against one of the blocks J1 of the chuck, whereby upon proper adjustment of the same, the

tube is securely gripped between the blocks. The face of the bore of the blocks forming the "chuck is knurled as indicated at J 2 in Figure 2, to assist the gripping action.

A3, A3 are plates secured to and overlapping the opposing edges of the spaced walls A2, against which the blocks forming the chuck are adapted to bear. A4 are bars connecting the bearing A1 with the spaced walls A2, t'o stiiien the frame.v

Having indicated the several parts by reference letters, the construction and operation of the device will be readily understood.

The pipe to be Hanged is supported by-the chuck J by the adjustment of the set-screw L. The screw shaft D carrying the cone-shaped head D1 is then rotated by the crank arm G to a point adjacent the end of the dprojecting tube. The nut H is then adjuste upon the screw shaft to a position permitting the screw shaft to be rotated sufficiently for the taper-L ing head to enter the. tube K, thereby the end of the tube.

The nut H is then adjusted upon the screw shaft D until it contacts with the face of the Haring bearing A1 thus limiting further rotation and insuring the production of tubes with smooth uniform flanges.

aving once set the nut I-I to limit the forward movement of the tapering head D11 it will not be necessary to readjust it when forming-anges on other tubes of the same diameter.

The set-screw I must be adjusted to secure the bushing against rotation when again rotating the screw shaft to force the head into the end of the tube to produce the flaring ange. The screw I is then released as before that the shaft may be free to rotate and thus permitting the rollers E carried by the head to smooth and burnish the inner face of the Hangc.

While I have shown tubes formed with outwardly inclined. flanges-it will be quite obvious that the device is equally adapted to form an inwardly bent Hange upon fitting the screw shaft with a suitably-shaped formingy head.

Having thus described my invention, what I claim is:

1. In a device of the character described,

a frame; a screw shaft having a cone-sha ed head at one end; -a screw-tapped bushlng rotatable in a bearing provided in the frame foi` supporting the shaft; a stud supported in the wall of the bearing, extending into a peripheral groove in the wall of the bushing; a set-screw mountedin the wall of the bearing, adapted to secure the bushing against rotation; means for rotating the screw shaft; means for limiting the 'rotation and forward movement of said screw shaft; and means for gripping and supporting a tube in axial alignment with said cone-shaped headand shaft.

2. In a device of the character described, a frame; a screw shaft having a cone-shaped head at .one end-Y; a plurality of rollers housed in bores formed in the cone-shaped head and projecting throughv slots in its inclined face; a screw-tapped bushing rotatable in a bearingfor supporting the shaft; means for securing said bushing in its bearing against rotatiog with the shaft; means for rotating the scr w shaft; means for limiting the rotation an forward movement of the screw shaft; and means for gripping and supporting a tube in axial alignment with said coneshaped head and shaft.

3. In a device of the character described, a frame; a screw-threaded shaft having a coneshaped head at one end provided with a plurality of bores parallel with the coneshaped face of the head; a plurality of rollers respectively' journalled in said bores, the periphery of said rollers extending through slots in the inclined face of said head; a nut screwed on said shaft adjacent the head adapted to receive the end thrust of said rollers; a screw-threaded bushing loosely journalled in the frame to receive and support said shaft; means for securing said bushing against rotation lwhen required; means for rotating said shaft; and means for supporting the tube in axial alignment with the cone-shaped head and shaft.

4. In a device of the character described, a frame including a handle; a screw shaft having a cone-shaped head at one end; a plurality of rollers housed in bores formed in the bushing rotatable in cone-shaped head and projecting through slots in its inclined face; a screw-tapped a bearing for supporting the shaft; means for securing said bushing in its bearing against rotation with the shaft; meansy for rotating the screw shaft; an adjustable nut mounted on 'said screw shaft adapted to limit the rotation and forward movementof .the screw shaft upon the nut contacting With the end of the bushing; and means for gripping and supporting a tube in axial alignment with said coneshaped head and shaft.

In testimony whereof, I sign this specification.

WILLIAM E. ARNDT. 

